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- function flatten(array) {
- let flat_array = [];
- let len_array = array.length;
- for (let i = 0; i < len_array; i++) {
- if (Array.isArray(array[i])) {
- flat_array = flat_array.concat(flatten(array[i]));
- } else {
- flat_array.push(array[i]);
- }
- }
- return flat_array;
- }
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